Physics
If the length of a simple pendulum is halved then its period of oscillation is

Increased by a factor 2
Doubled
Decreased by a factor 2
Halved

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Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Creates mechanical energy
Creates electrical energy
Converts electrical energy into mechanical energy

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Physics
Purpose of an optical filter is to

Transmit or absorb light of different colours
Reflect lights of different colours
Refract light of different colours
Dispense light into component colours

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